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NEW QUESTION 42
Select true statements about index performance.

• A. Indexes cannot decrease insert throughput.
• B. Indexes don't have to be completely stored in RAM, but permanent disk access to retrieve index information will have a performance impact.
• C. For the fastest processing, we should make sure our indexes fit entirely in RAM.

Answer: B,C

Explanation:
https://www.mongodb.com/blog/post/performance-best-practices-indexing

NEW QUESTION 43
In which of the following CRUD operations can you specify a write concern? Select all that apply.

• A. db.collection.updateMany()
• B. db.collection.insert()
• C. db.collection.update()
• D. db.collection.insertOne()
• E. db.collection.find()

Answer: A,B,C,D

Explanation:
https://docs.mongodb.com/manual/reference/write-concern/

NEW QUESTION 44
Which of the following statements are true regarding MongoDB views?

• A. MongoDB views themselves don't contain data.
• B. Write operations to views will raise an error.
• C. MongoDB views are created on demand and reflect the data in the source collection.
• D. Views are read only.
• E. Views are write only.

Answer: A,B,C,D

Explanation:
https://docs.mongodb.com/manual/core/views/

NEW QUESTION 45
Suppose we have a products collection with the following fields and values: _id (automatically created ObjectId) product_code (unique values for each product) color (as String values) size (this field is missing for some products) origin_country Which of these fields would be the best shard key?

• A. _id
• B. color
• C. size
• D. origin_country
• E. product_code

Answer: E

Explanation:
With color, size, and origin_country we run the risk of low cardinality. The _id wouldn't make a good shard key because it isn't something meaningful we could query the database. https://docs.mongodb.com/manual/core/sharding-shard-key/

NEW QUESTION 46
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